I have discussed this on this thread before and published my thoughts based on Fourier analysis that inaudible frequencies contribute to the audible spectrum especially when it comes to transient response. As an experiment I started thinking about cables that must, as per application, pass very wide frequency bandwidth. If indeed cables as these exist they should sound better to my ears (yes my 61 year old ears
).
So as I though about this, it occurred to me that CAT 5/6 must pass data at GigaBit rates to avoid data loss. So I took two 6 foot lengths of CAT 5e, stripped the ends, tied all the white striped together (positive), all the solids together (negative), and replaced my off the shelf, cheap, speaker cable with the 5e cable.
I was not expecting much but I was blow away by the increase in detail with these cables. Going back sounds lifeless now. Some will say it is in my head, but I don't think so. I recommend that you try this for yourself. I am going to make a HD600 HP cable from this stuff when I get a chance.